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katrin2010 [14]
3 years ago
8

Another multiple-choice question! which one?

Mathematics
1 answer:
Delicious77 [7]3 years ago
3 0

Answer:

the second one

Step-by-step explanation:

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Some types of algae have the potential to cause damage to river ecosystems. Suppose the accompanying data on algae colony densit
kondor19780726 [428]

Answer:

The equation of the regression line is:

y~=~234.56158 ~-~ 2.95835 \cdot x

Step-by-step explanation:

The Least Squares Regression Line is the line that makes the vertical distance from the data points to the regression line as small as possible. It’s called a “least squares” because the best line of fit is one that minimizes the variance.

We have the following data:

\begin{array}{c|ccccccccc}X&50&55&50&79&44&37&70&45&49\\Y&152&48&22&35&43&171&13&185&25\end{array}

To find the line of best fit for the points:

Step 1: Find X\cdot X and X\cdot Y as it was done in the table

Step 2: Find the sum of every column:

\sum{X} = 479 ~,~ \sum{Y} = 694 ~,~ \sum{X \cdot Y} = 32784 ~,~ \sum{X^2} = 26897

Step 3: Use the following equations to find a and b:

\begin{aligned}        a &= \frac{\sum{Y} \cdot \sum{X^2} - \sum{X} \cdot \sum{XY} }{n \cdot \sum{X^2} - \left(\sum{X}\right)^2} =             \frac{ 694 \cdot 26897 - 479 \cdot 32784}{ 9 \cdot 26897 - 479^2} \approx 234.56158 \\ \\b &= \frac{ n \cdot \sum{XY} - \sum{X} \cdot \sum{Y}}{n \cdot \sum{X^2} - \left(\sum{X}\right)^2}        = \frac{ 9 \cdot 32784 - 479 \cdot 694 }{ 9 \cdot 26897 - \left( 479 \right)^2} \approx -2.95835\end{aligned}

Step 4: Assemble the equation of a line

\begin{aligned} y~&=~a ~+~ b \cdot x \\y~=~234.56158 ~-~ 2.95835\cdot x\end{aligned}

The graph of the regression line is:

5 0
4 years ago
Five multiples of 3 that are not in the product game board
Kruka [31]
The answer is 1,3 you can check

4 0
4 years ago
Is 3/8 greater than 4/9
BARSIC [14]
No 4/9 is greater than 3/8

hope this helps
4 0
4 years ago
I need help and fast
igomit [66]
It’s “C” I got it right when I had this question before
8 0
3 years ago
Read 2 more answers
I need help with this question im not too good at biology
weeeeeb [17]

Answer and Step-by-step explanation:

H.o../.m//oz.y.g.o.u.s. m.e.a.n.s. .t.h.e. a.l.l.e.l.e.s. .o.f .a. .g.e.n.e. .or. .g.e.n.e.s. are identical for a trait.

He/t//erozygous means the a.l.l.e.l.e.s of a g.e.n.e or .g.e.n.e.s. are not identical for a t.r.a.i.t., meaning that they have a recessive g.e.n.e along with a d.o.m.i.na.n.t g.e.n.e.

When we combine the H.o.m././.o.z.y.g.o.u.s .d.o.m.i.n.a.nt P.ur.p.l.e. .F.l.o.we.r. <em>F//F</em> with the h.o//.m./o.z.y.g.o.us. re.c.e.s.s.i.v.e. .w.h.i.t.e. .p.l.an.t <em>f//f</em>, the result is that all of the offspring will be purple in appearance, meaning that the number of offspring that will be purple is <u>D. 4.</u>

<u></u>

<u></u>

<u></u>

<em><u>#teamtrees #PAW (Plant And Water)</u></em>

5 0
3 years ago
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